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RedHat 9 (Linux i386) - man page for ppmbrighten (redhat section 1)

ppmbrighten(1)						      General Commands Manual						    ppmbrighten(1)

ppmbrighten - change an images Saturation and Value from an HSV map
ppmbrighten [-n] [-s <+- saturation>] [-v <+- value>] <ppmfile>
Reads a portable pixmap as input. Converts the image from RGB space to HSV space and changes the Value by <+- value> as a percentage. Likewise with the Saturation. Doubling the Value would involve ppmbrighten -v 100 to add 100 percent to the Value. The 'n' option normalizes the Value to exist between 0 and 1 (normalized).
pgmnorm(1), ppm(5)
Copyright (C) 1990 by Brian Moffet Copyright (C) 1989 by Jef Poskanzer. Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, pro- vided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in sup- porting documentation. This software is provided "as is" without express or implied warranty.
This program does not change the number of colors. 20 Nov 1990 ppmbrighten(1)